// 系统函数

//删除左右两端的空格
function trim(str){ 
　　return str.replace(/(^\s*)|(\s*$)/g, "");
}
//删除左边的空格
function ltrim(str){ 
　　return str.replace(/(^\s*)/g,"");
}
//删除右边的空格
function rtrim(str){ 
　　return str.replace(/(\s*$)/g,"");
}


// plugin author :  chenjinfa@gmail.com
// plugin name : $.include
//     $.include('file/ajaxa.js');$.include('file/ajaxa.css');
//  or $.includePath  = 'file/';$.include(['ajaxa.js','ajaxa.css']);

$.extend({
    includePath: '',
    include: function(file) {
        var files = typeof file == "string" ? [file]:file;
        for (var i = 0; i < files.length; i++) {
            var name = files[i].replace(/^\s|\s$/g, "");
            var att = name.split('.');
            var ext = att[att.length - 1].toLowerCase();
            var isCSS = ext == "css";
            var tag = isCSS ? "link" : "script";
            var attr = isCSS ? " type='text/css' rel='stylesheet' " : " language='javascript' type='text/javascript' ";
            var link = (isCSS ? "href" : "src") + "='" + $.includePath + name + "'";
            if ($(tag + "[" + link + "]").length == 0) document.write("<" + tag + attr + link + "></" + tag + ">");
        }
    }
});